unknown 8x12 chase

Hello All,
Anyone know what kind of press this chase might go to? No markings, but it has those little nipples on the sides and a slightly grooved back. 8x12. Any help would be greatly appreciated. Cheers.

image: chase 1.jpg

chase 1.jpg

image: chase 2.jpg

chase 2.jpg

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The chases for my 6x9 Sigwalt Nonpareil have small double-wedge-shaped lugs on the ends of the chase which slide behind two round pins on the insides of the roller rails to hold the chase in the bed securely. This looks to me like a similar system for holding the chase on the press bed, probably for a similar table-top hand jobbing press. Might even be Sigwalt.