Mad!!! I want one,You seem to find some unique models:)I love this,the chassis style is fantastic.I had a quick peek too,Not a thing,Though I did cross reference this to trademarks and the TRU BILT brand name from the 50s and only came up with a boot manufacturer,So who knows.Many engineering companys had their hands in all sorts of stuff."Amplion"as far as I know was a leading manufacturer of quality Speakers and sound equipment,from what I understand but also produced some early generators and chargers and industrial engines,then on to lawn mowers.Also check the tyres for markings and the bolt heads,in some cases they may be maker stamped,pretty sure bolts would have been sourced locally back then,might give you another lead into country of manufacture:)
Anyways I love it!