here is a reference from someone over on leverguns

by cable, Friday, November 08, 2013, 19:40 (4038 days ago) @ bj2

this was offered at greg martin auctions in a major sale in 2007, the picture is no longer available on the archive:

https://www.proxibid.com/asp/LotDetail.asp?ahid=1290&aid=6700&lid=2171260

*colt Colteer Experimental/prototype Lever Action Rifle

Lot #485 (Sale Order: 485 of 828)

Sold for: $650.00

Item Description:
Serial no. XP8, .22 long rifle caliber, x19-inch barrel; blued finish with anodyzed aluminum frame and cocking lever. Varnished semipistol grip stock with composition rampant colt logo buttplate.
Condition: Fine; excepting In need of repair, including mechanism and attachment of buttstock.
Notes: Made in the 1960s for short period; see R.L. Wilson, THE BOOK OF COLT FIREARMS for example.
Estimate: 800 - 1200

Greg Martin Auctions
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I suppose that colt had shown a picture of the prototype and it was in an ad that i saw..

i distinctly remember the semiautos including the short one with the saddle ring, but being more interested in the gun with the lever, which as i recall, looked otherwise identical.

wish i had seen this auction, i might have grabbed it.

Item Description:
Serial no. XP8, .22 long rifle caliber, x19-inch barrel; blued finish with anodyzed aluminum frame and cocking lever. Varnished semipistol grip stock with composition rampant colt logo buttplate.
Condition: Fine; excepting In need of repair, including mechanism and attachment of buttstock.
Notes: Made in the 1960s for short period; see R.L. Wilson, THE BOOK OF COLT FIREARMS for example.
Estimate: 800 - 1200