Interesting Collar Bar

[Harry Pierpont]

Picked this up today in an antique shop.
It says patent pending and Rink-Less on both sides of the bar.
This is the back:

And this is the front and side view (so you can see the curve):

 

[Dinerman]

Cool!
here's a picture of one like it stolen from another thread.

 

[Harry Pierpont]

Thanks Dinerman, any ideas as to date? I see the carded one has a patent # and this one still says Pat. Pend.