Starrett 52 Surface Gauge?

[BBMark]

Yet another eBay purchase this old piece is unmarked except for having JR stamped which I assume is an owner's mark. The I believe the base has to be a Starrett no. 52 and it has been drilled and tapped. The snug and height adjustment knobs have very different knurling than what would be expected on a Starrett tool. The knobs and snug appear to be nickle plated brass. The post definitely looks right but is not stamped to ID it as Starrett.

Thoughts?

Thanks!

 

[RTM]

I don’t see a similar base in Brown & Sharpe, Moore & Wright, or Lufkin . Don’t see tapped holes mentioned in any of the catalogs around 1930. Wonder is someone tapped the front to make an edge following fence.

This one has a clamp on guide.

Starrett Tools 50th Anniversary : Catalog No. 25 : L. S. Starrett Co. : Free Download, Borrow, and Streaming : Internet Archive

388 p., illus., 18.7 cm, trade catalog

archive.org

One of my normal shaped ones have pins which push down, like this one.

Starrett Tools 50th Anniversary : Catalog No. 25 : L. S. Starrett Co. : Free Download, Borrow, and Streaming : Internet Archive

388 p., illus., 18.7 cm, trade catalog

archive.org