This Spiratone Macrotar is a compact vintage macro lens.

This one has a Nikon F mount. It seems really rare, I was not able to find information about this lens with this specific mount. It was probably used with a bellow.

It has no helicoid. Used like this, it gives a ~2.5 magnification ratio on an APS-C sensor (60mm/24mm).

I took the coin pictures with a Nikon helicoid adapter on a Sony APS-C mirroless camera.

For me it's a keeper, but I have another version of the same lens.

Feel free to ask any questions.