Buy whatever you like, pay whatever you want and be happy to get the stuff that makes you happy. I always prefer stuff with a story, and a good cause, myself.
I bought that so called Niedner that was a Biesen trap buttplate and I didn't hesitate after Michael's hit $170 my top bid. I have one of those as well…but not from MP.
I'll be offering a Marbles tang sight for a Marlin next week, along with a Lyman for a 30 carbine and a couple more. I've got a bunch of vintage peep sights and always sell on ebay and let the buyers set the price.
Bid well...