Made in England, Lone Star made models at least as early as the 1950s with a line of military models. About 1962 they produced a small series of 1/50 scale models, which tools were later used for Tootsietoy in their "Classics" range made in the mid-1960s. These were little more than a body shell on wheels, durably built for play. Sometime mid 1960s a more extensive line closer to 1/64 but with varying scales was introduced. Impy Super Cars had the most features of any small scale diecast before or since. Models typically had opening doors, hood and trunk, and spring suspension, a clever rock to steer function, and jeweled headlights. As often happened in the late 1960s with the introduction of Hot Wheels, the line was modified and their own "Flyers" wheels were introduced, and the cars steadily lost their features, the jeweled lights and opening doors being some of the first to go. But it wasn't enough to save the company, which soldiered on through the 1970s gradually cheapening their cars, and even a reintroduction of the Impy name was not enough to save them by the end, at which time hoods and trunks had been sealed and even interiors disappeared. The company folded about 1980. They do still have some highly sought models, in particular the Vauxhall Firenza has a rabid following as that model is only covered by Lone Star, and from what I've been told the Firenza enjoyed some success on the track back in the day. Lone Star also made some country specific law enforcement vehicles, particularly on the VW Bus and Mercedes Saloon models, some of which are quite uncommon and highly sought.
Lone Star, Roadmasters, Impy, Flyers, Super Cars Model List
IMPY SUPER CARS model list:
110 Jaguar Mk X
111 Gran Turismo Coupe (C2 Corvette)
112 Imperial (Hardtop)
113 Ford Thunderbird (US) (*unconfirmed)
114 Ford Zodiac Mk III Estate (GB)
115 Volkswagen Micro Bus
116 Motorway Police Patrol Car (Imperial)
117 Mercedes-Benz 220SE
118 Ford Corsair (GB)
119 Volvo 1800S
120 Volkswagen Ambulance (Micro Bus)
121 Fiat 2300S Coupe
122 Rolls Royce Silver Cloud III
123 Alfa Romeo Giulia 1600 Spider
124 Foden Open Truck (Dump, Tipper)
125 Tractor
126 Foden Tanker
127 Ford Taunus 12M (G)
128 Peugeot 404
129 Cement Mixer Lorry
130 Merryweather Fire Engine
131 Ford Transit Breakdown Lorry
132 Fire Chief Car (Ford Corsair)
133 Mobile Crane
134 Euclid Caterpillar Tractor
135 Articulated Flat Truck
IMPY FLYERS model list: (Super Cars list plus)
7 Vauxhall Firenza
8 Ford Capri Sport (*unconfirmed)
9 Maserati Mistrale
10 Jaguar Mk X
11 Gran Turismo Coupe (C2 Corvette)
12 Imperial (Hardtop)
13 Toyota 2000GT
14 Ford Zodiac Mk III Estate (GB)
15 Volkswagen Micro Bus
16 Motorway Police Patrol Car (Ford Zodiac Estate)
17 Mercedes-Benz 220SE
18 Ford Corsair (GB)
19 Volvo 1800S
20 Volkswagen Ambulance (Micro Bus)
21 Fiat 2300S Coupe
22 Rolls Royce Silver Cloud III
23 Alfa Romeo Giulia 1600 Spider
24 Foden Open Truck (Dump, Tipper)
25 Tractor
26 Foden Tanker
27 Ford Taunus 12M (G)
28 Peugeot 404
30 Merryweather Fire Engine
31 Ford Transit Breakdown Lorry (Ford Wrecker Truck)
32 Fire Chief Car
33 Mobile Crane
34 Euclid Tractor
35 Articulated Flat Truck
36 Lotus Europa
37 Ford GT40 (*unconfirmed)
38 70s (C3) Chevrolet Corvette
39 Ford Mustang
40 Cadillac (1967 Eldorado)
LONE STAR IMPY (trucks / lorries) (circa 1976) also called COMMERCIALS
44 Marine Transport (likely same as #53)
50 Tipper Truck
51 Bulk Carrier
52 Crane Truck
53 Marine Transporter
54 Cement Mixer Truck
55 Express Freight Truck
56 Low Sided Truck
57 Water Tank Truck
58 Sand Truck
59 Water Pipe Truck
60 Timber Truck
61 Petrol Tanker
71 Range Rover
72 Cadillac Eldorado
73 Chevrolet Corvette Stingray Fastback
74 Toyota Sports (2000 GT)
75 Police Range Rover
76 GT Rallye (C2 Corvette)
77 Jaguar Mk X
78 Maserati Mistrale
79 Ford Mustang
80 Lotus Europa
81 Volvo 264
82 Mercedes-Benz 220SE
Volvo 262C
PLAYSET:
Japanese Market Playset Mustang, Merriweather Fire Engine and Pipe Truck
IMPY MAJORS model list:
181 Crane Truck
182 Fuel Tanker
184 Pipeline Transporter
1281 MILK TANK TRUCK
1283 SAND QUARRIES TRUCK W/SCOOP
1284 LS TRANSPORT CO. TRUCK
1291 ESSO PETROL TANK TRUCK
1293 MI BREAKDOWN WRECK TOW TRUCK
Roadmasters 1/50 scale tools shared with Tootsietoy
'62 Cadillac Fleetwood
'60-62 Chevrolet Corvair
'60 Chevrolet El Camino
'62 Dodge Dart Phoenix
'60 Ford Sunliner convertible
'62 Rambler Cross Country station wagon
'62 Royce Silver Cloud II
TUF TOTS model list (*partial list, these are micro scale, probably close to OO or HO scale):
Landrover
Citroen
Citroen convertible
Jeep (and trailer)
Tanker Truck
Corvette convertible
Dump Truck
Lone Star, Roadmasters, Impy, Flyers, Super Cars Model List
IMPY SUPER CARS model list:
110 Jaguar Mk X
111 Gran Turismo Coupe (C2 Corvette)
112 Imperial (Hardtop)
113 Ford Thunderbird (US) (*unconfirmed)
114 Ford Zodiac Mk III Estate (GB)
115 Volkswagen Micro Bus
116 Motorway Police Patrol Car (Imperial)
117 Mercedes-Benz 220SE
118 Ford Corsair (GB)
119 Volvo 1800S
120 Volkswagen Ambulance (Micro Bus)
121 Fiat 2300S Coupe
122 Rolls Royce Silver Cloud III
123 Alfa Romeo Giulia 1600 Spider
124 Foden Open Truck (Dump, Tipper)
125 Tractor
126 Foden Tanker
127 Ford Taunus 12M (G)
128 Peugeot 404
129 Cement Mixer Lorry
130 Merryweather Fire Engine
131 Ford Transit Breakdown Lorry
132 Fire Chief Car (Ford Corsair)
133 Mobile Crane
134 Euclid Caterpillar Tractor
135 Articulated Flat Truck
IMPY FLYERS model list: (Super Cars list plus)
7 Vauxhall Firenza
8 Ford Capri Sport (*unconfirmed)
9 Maserati Mistrale
10 Jaguar Mk X
11 Gran Turismo Coupe (C2 Corvette)
12 Imperial (Hardtop)
13 Toyota 2000GT
14 Ford Zodiac Mk III Estate (GB)
15 Volkswagen Micro Bus
16 Motorway Police Patrol Car (Ford Zodiac Estate)
17 Mercedes-Benz 220SE
18 Ford Corsair (GB)
19 Volvo 1800S
20 Volkswagen Ambulance (Micro Bus)
21 Fiat 2300S Coupe
22 Rolls Royce Silver Cloud III
23 Alfa Romeo Giulia 1600 Spider
24 Foden Open Truck (Dump, Tipper)
25 Tractor
26 Foden Tanker
27 Ford Taunus 12M (G)
28 Peugeot 404
30 Merryweather Fire Engine
31 Ford Transit Breakdown Lorry (Ford Wrecker Truck)
32 Fire Chief Car
33 Mobile Crane
34 Euclid Tractor
35 Articulated Flat Truck
36 Lotus Europa
37 Ford GT40 (*unconfirmed)
38 70s (C3) Chevrolet Corvette
39 Ford Mustang
40 Cadillac (1967 Eldorado)
LONE STAR IMPY (trucks / lorries) (circa 1976) also called COMMERCIALS
44 Marine Transport (likely same as #53)
50 Tipper Truck
51 Bulk Carrier
52 Crane Truck
53 Marine Transporter
54 Cement Mixer Truck
55 Express Freight Truck
56 Low Sided Truck
57 Water Tank Truck
58 Sand Truck
59 Water Pipe Truck
60 Timber Truck
61 Petrol Tanker
71 Range Rover
72 Cadillac Eldorado
73 Chevrolet Corvette Stingray Fastback
74 Toyota Sports (2000 GT)
75 Police Range Rover
76 GT Rallye (C2 Corvette)
77 Jaguar Mk X
78 Maserati Mistrale
79 Ford Mustang
80 Lotus Europa
81 Volvo 264
82 Mercedes-Benz 220SE
Volvo 262C
PLAYSET:
Japanese Market Playset Mustang, Merriweather Fire Engine and Pipe Truck
IMPY MAJORS model list:
181 Crane Truck
182 Fuel Tanker
184 Pipeline Transporter
1281 MILK TANK TRUCK
1283 SAND QUARRIES TRUCK W/SCOOP
1284 LS TRANSPORT CO. TRUCK
1291 ESSO PETROL TANK TRUCK
1293 MI BREAKDOWN WRECK TOW TRUCK
Roadmasters 1/50 scale tools shared with Tootsietoy
'62 Cadillac Fleetwood
'60-62 Chevrolet Corvair
'60 Chevrolet El Camino
'62 Dodge Dart Phoenix
'60 Ford Sunliner convertible
'62 Rambler Cross Country station wagon
'62 Royce Silver Cloud II
TUF TOTS model list (*partial list, these are micro scale, probably close to OO or HO scale):
Landrover
Citroen
Citroen convertible
Jeep (and trailer)
Tanker Truck
Corvette convertible
Dump Truck