The Ricoh 55mm f/2.2 was the standard kit lens supplied with Ricoh's screw-mount SLRs of the early 1970s, including the Ricoh Singlex and Auto TLS series, before the company later fitted a similarly specified lens to its Pentax K-mount XR-series bodies.
Engraved 'Rikenon', the lens is a modest six-element double-Gauss design typical of standard primes from this period. The original version was built in M42 screw mount; a later Pentax K-mount variant of the same specification was supplied with Ricoh's KR/XR-series bodies from the late 1970s.
Wide open it renders with the soft-edged, gentle contrast typical of budget-tier 1970s standard lenses, sharpening noticeably by f/5.6. It is not a lens sought for character so much as an affordable, honestly built normal lens for period Ricoh bodies.
Examples are common and inexpensive on the used market, often bundled with the camera body rather than sold separately. Buyers should check for haze on the rear element, a frequent issue with Rikenon lenses of this generation, and confirm the aperture ring clicks positively at each stop.