unmarked long silver objective lens?

[SnowyNW]

What kind of objective is this??

[PeteM]

The objective is missing its outer shroud, which would have had the markings. Just guessing from the Nikon turret and the size of the visible lens, I'd guess that it's a Nikon finite objective around (+/-) 10x. It will work without the shroud and it should be possible to figure the magnification either by comparison with known objectives or viewing a transparent printed rule or dedicated micrometer slide. Is the objective next to it, with the yellow band, a 10x? If so, does this one magnify more or less?

[SnowyNW]

Thanks for the input, yes the yellow banded objective is a 10x. When I try to match the magnification to my other scope's objectives, it looks to be a 40x, and has a phase contrast ring. But when searching for a matching 40x, none of the tips match this one, but instead match the 20x. I was looking specifically at LWD Ph1 ADL objectives, which the yellow is. its gotta be a 40x, what am I missing? Any advice?