One of mine still has the original sticker on it but it has been painted over. Also with what I've had and seen most of them originally seemed to have came with a side popper unless they were purchased in a kit form minus the engine.
1968-69 model year bikes were listed as coming with 3hp and they were rear exhaust, The earlier catalogs list 2 1/4 hp even up to 1967 (I think H22's were actually discontinued earlier than that though). they show as Clinton engines (not named though) in the catalogs for 1968 1969 model years but to find one with a clinton would be a rarity. Clinton problaby hoped to supply them but could not as that was shortly after Mr. hoffinger bought Clinton when they went bankrupt. He was rebuilding from almost a standstill from what I have read. Of course Hoffinger offered his own line of bikes at the end of 1968, First though a company called Perspex, but ended up putting them under the Lomart brand name when they came to market for 1969.
Crue cut, which was the company that worked with Fox in regards to the Bodied karts/mini cars that fox offered in the 1960's had a better depiction of the version of the sprite in those times they sold in their catalog: