It wasn't until I came across this recent purchase that I realised I was missing a coin from a fairly important Vespasianic bronze issue. It's not the most eye-catching example, but it suits me just fine. Vespasian Æ As, 11.55g Rome mint, 71 AD Obv: IMP CAES VESP AVG P M T P COS IIII CENS; Head of Vespasian, laureate, r. Rev: PAX AVGVST; S C in field; Pax stg. l., leaning on column, with caduceus and branch RIC 589 (C). BMC spec. acquired 1958. BNC 655. Acquired from Lost Dutchman Rare Coins, July 2020. In 73 Vespasian and Titus Caesar held a joint censorship which was duly recorded on the coinage. This fairly worn As is from the very first bronze issue recording that censorship. Most Asses from the issue are quite rare - this Pax type is probably the most 'common' reverse of the group. The right facing portrait variant was missing from the BM's collection until 1958, hinting it may be slightly rarer than the left facing. Admittedly, not a spectacular addition by any means, but one I'm very pleased with nonetheless. Feel free to post your coins that only a specialist could love.
I agree with @Orfew that is a great portrait! Very nice to add that to your collection. You have reason to be happy and proud. Congrats!