I believe this is the Winchester Windgage Globe Sight No. 69B which was furnished with or without the spirit level. 
Value posted as $300-$500 in Nick Stroebel: Old Gunsights & Rifle Scopes.

From Stroebels book, the Remington doesn't look like it has those "ears".  It looks close, but not quite right.

Since it's a 5/16 dovetail sight, I'm not sure Winchester ever built a gun with that dovetail size? If it's a Winchester, then Winchester must have made it for other maker's guns.

Looks like a 1980s-vintage Mike Stevens sight made on the Ballard pattern with custom 5/16" dovetail for Maynards. Mass. Arms often used 3/8" Ballard sights shimmed for 5/16" slots.

Jeff_Schultz wrote on Feb 11^th, 2015 at 8:12pm:


  My mind must've read 5/8" instead! 

No drawings...but here is a photo of a shimmed 3/8" Ballard base on a Maynard target rifle with a wider cut:
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I've seen a number of original Mass. Arms Maynard higher-grade target rifles fitted with Ballard windgage front sights adapted in this way. (The spirit level wedge is a modern addition made by the late Michael Stevens.) I've been told that Mike would customize the base of his sights to help shooters fit them to odd or off-size dovetail cuts.

EDIT:
I have a difficult time telling the difference between some of the various windgage sights...so the one in the ad may be a Winchester or a late Remington repro. by Mr. Stevens...? The "88" serial # is another giveaway, as he numbered his sights and usually stamped an "S" somewhere. Since the base has been filed down a bit...that's probably where it was.

You can make your own drawing of a shim by measuring actual angles depths and widths of your 3/8" sight base dovetail and the Maynard dovetail cut you want to install it in. (BTW...I've read in several authoritative places, such as James Grant, where early Remington and Maynard front sight cuts are ordinarily a nominal 30/64" -- not 5/16".) Making a strip of shim stock doesn't look like a difficult job for someone with access to a mill.

marlinguy wrote on Feb 12^th, 2015 at 11:03am:


HeHe! All these different numbers flying around in that ad and in my senior mind. 

So far as I know, Maynard target front sight slots (at least on the 1873 and 1882 models) were a nominal 30/64" wide - Early Remington front sights, too.

From Grant's reference and my experience, Maynard rear sight slots were usually less than 3/8" wide at a nominal 18/64". With Maynard rifles there are no hard and fast rules, but I have never seen one of their front sight slots cut that narrow.