Yup, that's a "Junior"...
The only thing that makes it a "little toilet" is the size of the bowl (and if you think it IS small, you need to check out some "compact" marine toilets)... Marine toilet bowls come in two sizes--"standard" to fit on said "compact" toilets and/or in tight spaces...and what used to be called "highboy" and now renamed "household" (apparently the industry didn't think most people were smart enough to figure out that "highboy" means "larger"). The highboy size will fit your toilet. Bemis is the brand name for 99% of marine toilet bowls.
20 years ago, the W-C Junior sold for about somewhere between $500-700. Rebuild kit prices are all over the wall--Defender was lowest at $117...WM was highest at $184

. Google "WC Junior rebuild kit" to find the best deal. Someone on another board offered one for sale last year, asking $300 for one that he had rebuilt...replies didn't indicate he was nuts, so I'd guess $200-400 is reasonable to ask depending on condition. From the photos it looks like someone has certainly done a major cleaning and polish job on it, so it'll show well.
Got your email, I'll reply with the drawings and parts list.