This is a viewfinder correction lens for a 1950s Corfield Periflex 3 camera - I think it may also fit the later Periflex Gold Star but I'm not 100% sure. It is not compatible with Periflex 1 or 2. It's a screw-in lens which replaces the front elements of the direct vision viewfinder and makes the angle of view right for a 35mm lens.

This is in good condition but needs cleaning. The box it is in was originally for the finder for a 28mm lens and is marked as such.

I'm separately selling a non-working Corfield Periflex 2 with 45mm f2.8 lens, a 50mm f2.4 Periflex lens, and other photographic items. If you buy multiple items from me please request a combined postage invoice, I'll do my best to get it down to the lowest possible price. I do not make any profit on postage. Due to the size of the cylindrical box, over 25mm in all dimensions, this must be sent as a parcel.

International buyers: The postage price shown is based on an estimate of packed weight, under 100g; if it turns out to be cheaper than expected I will refund the balance. Please note that eBay will add VAT or sales tax to the final price in some countries.