After checking with Dane Kurth, the expert, at Wildwinds it has been confirmed as Mueller 74 type. Another member coincidentally found the decades old Mueller catalogue with the same description. Lysimachos, Kingdom of Thrace, AE 20mm, 5.20 gr. Generous flan. Lysimachia mint. 305-281 BC. Helmeted head of Athena right / BAΣIΛEΩΣ ΛYΣIMAXOY, above and beneath lion leaping right, spearhead and M on O monogram below. Mueller 74. Show your lions as the main theme
LYSIMACHUS KING OF THRACIA AE 20 OBVERSE: Helmeted head of Athena right REVERSE: BASILEWS LUSIMACOU, above and beneath lion running right, small caduceus, spearhead below Struck at Uncertain mint, Thrace 305-281 BC 6.1g, 20mm SNG Cop1149-51
Great lion on that one! That Müller [AKA Mueller AKA Muller] book is available online in various places (your type, 74, is on Table IV of the catalog): https://www.google.com/books/edition/Die_Münzen_des_Thracischen_Königs_Lysi/KjUGAAAAQAAJ?hl=en Müller, L. Die Münzen Des Thracischen Königs Lysimacus. (Copenhagen, 1858). See also: https://www.forumancientcoins.com/numiswiki/view.asp?key=M%FCller
I just posted my second favorite lion -- a rare Rhegion Hemilitron -- in another thread: https://www.cointalk.com/threads/post-your-best-ugliest-ancients.407821/page-2#post-24721403 But my favorite-favorite Greek lion is the one below. Also a small AR fraction. This one from Thessaly: I couple of previous photos of this coin (among others), by Kirk Davis and from the Jameson Coll.: One more tiny silver Greek Lion (my 3rd favorite?) -- this one from an undetermined mint in Caria, c. 450-400 BCE: Excerpts from Silvia Hurter's 1998 publication on the "Unknown findspot (Turkey), before 1992" Hoard (CH 9, 359). No. 10 = this coin:
Do you have a contact email address for Dane? I've tried to submit a coin but my mail app doesn't like the automatic link they put on the website and it won't load.