Rivkin

Probably Kaga (nakago, suguha) and I would guess later Muromachi one.

By the way a very good example: https://www.facebook.com/permalink.php?story_fbid=pfbid0DuWnGr4pt2ChaYLf78neA1GxvTSRSijfmk8X9AxF8ZvWstPJS5DRM6k3U4em7Cipl&id=100064812335888 Classic late groupings, but top mainline Sukesada work predictably shows much stronger nie. Midare utsuri though very seldom encountered past 1500. It still feels in regards to the mumei blade shown the very well defined, uniform groupings might be suggestive of later than Oei attribution. I don't think its as late as Sukesada or Kiyomitsu, but it might be post Oei generation.

Hard to be sure. Sugata can be anything, but its not kodachi and then 22-24 inch blades generally would not be earlier than Muromachi. Hamon starts flat. Uncommon for Muromachi. Relatively dense jigane, but with some coloration. Very strong, harsh patchy nie. Generally in Soshu-Hitatsura you see strong nie during early Muromachi and then again during the Edo period. The writing with distinctive, deep triangular strikes, its more late than early in style, irrespective of whether its gimei or not. If its early Muromachi it does not look like Masahiro or related Soshu, long nie lines are like Uda. But Uda usually does not go into hitatsura. I would lean towards Edo period.

Again my apologies for misdirection. I am at fault for not even looking at the original signature besides its overall style. After investing quite some time in AI tools (diffusion based photo enhancer, kantei tool, and chatgpt sdk auto-translate) I had very good success with them for a while... and then ofcoarse they fail miserably without warning. Another challenge of our days, but first and foremost definitely my fault.

Thank you very much! And I should not hope chatgpt does the work for me.... I've been running it on auto-translate for the images for a while though....

Double post... I would say though with Muromachi Bizen its important to show entire nakago since there are quite a few clues to whether its original or not.

Signatures of this level ChatGPT translates with 90% accuracy. Bishu Osafune ju Sukesada. Its a lower grade signature which is somewhat roughly executed, but can be real and the blade sort of looks like late Muromachi. P.S. Chatgpt more often than not does good job on papers, sayagaki and books as well.

This sword has provenance, gold inlayed nijimei "Mitsutada", has been published in at least one book; probably more, but there was only one I could find right away by searching for "Osafune Mitsutada". Its polishing has been sponsored by Japanese government, the whole process has been covered in the journal of Nara Museum of Buddhist Art. Meito? Masterpiece?

Can't fool me. Its chikei.

I would say as common as midare utsuri. They go well together, while indeed mokume is quite common, but utsuri will typically be more simple. On Mino... I can finance the sword going to NBTHK for shinsa and I'll put 5,000 USD as wager. If it gets Bizen to one of Muromachi generations (simply because I can't guarantee they'll put a specific generation or period on the papers, its a bit random), I win 5,000$. If it gets Mino I lose 5000$ wager. If it gets neither I do not get compensated for the shinsa.

I would prefer higher res photo to see whats hadori and whats not, otherwise it might end up being Ichimonji or something [embarassing]. But it does have considerable "Go feel". I did not study many of his blades but there is this reocurring type widening above nakago, widening next to kissaki, ichimai. Exhibit is in matsumoto, probably Japanese based members know more, it has some nice items.

Looks like a particularly nice one... They have some sexy plastic sword stands for sale for the exhibit as well...

Looks like hakkikake or actually kaen with a bit of nijuba in the boshi.

There are conflicting opinions about recent work since after 1980s the economy of swordmaking has been slowly declining. But they are better. Early Showa is not impressive outside of a few names. Actually for better or worse post 1960 works tend to be really similar to shinshinto in stylistics. A bit artificial, harsh, strong lined, but bright and rich.

Very few only smiths who can be seen as extension of shinshinto, for example Gassan. The rest started anew with random steels and strange styles, only in late 1930s you start having Shibata Ka and other smiths who to an extent restore the tradition. Still, until 1970-1980s probably the quality was two grades below shinshinto.