【Unused】YAMAWA Hand Tap 5/16 W18 SKS Set of 3 x 3 sets

This is a hand tap set from the Japanese precision tool manufacturer YAMAWA.
It is being listed due to warehouse organization.
[Product Details]
Manufacturer: 彌満和製作所 (YAMAWA)
Size: 5/16 W18 (Whitworth thread / Inch thread)
Material: SKS (Alloy tool steel)
Set Contents: 1 set of 3 taps (taper, second, plug) x 3 sets (9 taps total)
[Product Condition]
Although unused, there are slight rust spots and dullness on some of the cutting edges and shanks due to long-term storage.
This does not affect usability in any way.
The plastic cases and paper boxes show signs of age-related deterioration such as dirt, fading, and tears from storage.
[Shipping & Other]
Ships via anonymous Yu-Packet Post.
This is an old tool, so it would be suitable for those who understand this, or as spares for DIY and crafting projects.
Immediate purchase is welcome. Thank you.