Markings

All Explorer Cars share the same chassis, marked with the LP trademark,
Made in Hong Kong text and number 404.
The 405A-C identification numbers are from the packaging these toys were found in
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Although usually found with friction-driven rubber wheels (left), the Explorer Cars also exist in a simple push-along version, fitted with a metal axle and black plastic wheels (right).

The Explorer Cars have the chassis of a German Panzer IV. Although somewhat larger, it is very likely copied from a contemporary RoCo Minitank model in H0 scale.

A different chassis exists for these vehicles, very likely made by another company.
Three versions have been found so far, the two shown here as well as a copy of the 404/405B version on this page. All have yellow bodies and green tracks, and came on a series of Starship Galaxy Unit One blister cards by an unknown manufacurer. Judging by the card graphics, they'd be later 1970s.