B&H claims they will have the Mod 54 in stock in March. It looks like they're back in production, possibly with a design update if the photos on their Facebook page are current. They should be available soon.
Wait where do you get design modification from?
Mamiya: 7 II, RZ67 Pro II / Canon: 1V, AE-1, 5DmkII / Kodak: No 1 Pocket Autographic, No 1A Pocket Autographic | Sent w/ iPhone using Tapatalk