Saya and tsuka age?

[katonk66]

Please forgive me, as I may have asked this question before, but in reference to the APPROXIMATE age of a tsuka or a saya...can this be determined by visualizing the bare wood in the koiguchi or tsuka opening?

[ROKUJURO]

You mean by dendrochronology ? Probably not. But a KOSHIRAE expert could perhaps make a good guess in case he can see the items in hand.