Curious, what do the markings on that "grey banket" frog post mean?

My interpretation: Showa 16, Osaka proof (Dai Mark in circle), then a badly stamped Nagoya mark then a Kyo for either 'Kyo'to or To'Kyo'. Wow! It sure traveled around... talk about subcontracting!
$500 bucks!? Ouch!

Ya, I thought that seemed pretty suspect. Repro or enhancement? It just doesn't seem kosher to me.