O-Pee-Chee finally matched Topps card-for-card in 1973, with the same number of players (660) and no checklist changes or on-card variations. Whiter card stock and a PRINTED IN CANADA tag line mark the only obvious differences--(UPDATE: plus French text translations on the back)--though it does seem OPC's print runs dropped off during the mid-70s, making those years harder to come by than singles from 1970 to 1972 and 1978 on. (Building complete sets from those years is not an easy undertaking.)
Brinkman placed ninth in 1972's MVP voting, an amazing finish considering the .203 batting average and .279 slugging. Ed did play every game for AL Eastern division-winning Detroit and won the aforementioned Gold Glove, good enough to outpace better-known guys like Jim Palmer and Reggie Jackson. (Full results at B-R.com.)
Value: Low-grade singles cost a dollar or two and OPC's rarity only seems to impact top-condition stars. (For example, CheckOutMyCards lists a mid-grade Bob Boone RC for $12, the same price as Topps versions.)
Fakes / reprints: Don't know of any OPC reprint issues and doubt someone would fake the set, given its low profile.