First of all: What a beautiful and rare frame! Thanks for posting it on here. Still, 500kY is around 3.5kĀ£/ā¬, thatĀ“s quite a confident price considering there are auction fees/customs/delivery (in a massive crate no less) to be paid. Speaking of shipping: Is the shippig crate original to the frame? There seems to be Mantis branding on the inside?
Regarding the inaccessability of Yahoo auctions: Yahoo changed the terms&conditions (I think in 2022?) and you can no longer directly view/partake in auctions from outside of Japan. However one can still use a forwarding service like buyee.jp, which places a bid for you and handles shipping/export (again, for a fee). HereĀ“s the link to the auction via buyee:
https://buyee.jp/item/yahoo/auction/c1080906380?conversionType=top_page_search
IĀ“ve used them before and itĀ“s a relatively straightforward process.