Toy size
Length
Width
Height
108 mm
55 mm
24 mm
4 1/4 in
2 3/16 in
15/16 in
Features
Spring-loaded barrel under fuselage shoots plated bullet-shaped missiles
Other then the extra pair of engines, there's hardly any difference between the Roxy copy and the Spacex original. But apparently the extra pair of engines was sufficient to make the Roxy design distinctive enough to have it registered (see below).
Markings
Spacex markings
Roxy trademark
Design Registration
UK Registered Design
944190
13 May 1970
Toy Space Vehicle