As seen in this Wards (Montgomery Ward) 1935 Christmas Catalog:
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"Pop-pop-pop! Just as fast as you pull the trigger
it cocks and shoots ... but the cork stays right in
the barrel. New type futuristic metal pop pistol
brightly colored ... 71/4 in. long; handsome tan and
red leather Holster set with 30-in. belt and 8-in.
holster with tabs. Ship. wt. 1 lb. 4 oz." 45 cents
Other space guns pictured on these two interior pages:
Buck Rogers Disintegrator (listed as "new"), Flash Gordon Signal Pistol, Buck Rogers Rocket Pistol
and Flash Gordon Radio Repeater Pistol (previously Timeline dated to 1936. See link below.).
And, elsewhere in the catalog, the Buck Rogers' Rocket Police Patrol ship.
This sighting confirms the 1935 Sears catalog sighting seen here:
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This 33 Repeater & Holster Set sighting moves the Timeline date back one year, from 1936 to 1935.
Here's the previous 1936 sighting: