Henri, The front ring on a Vivitar 135/2.8 Close Focus says "AUTO TELEPHOTO CLOSE FOCUSING ... No. 28xxxxxx... o62mm ... Vivitar... 135MM 1:2.8". It has minimum focus distance 0.8 m, weight 0.42 kg (incl. M42 > K adapter), max. diameter 70mm, length at inf focus 84mm. It is an excellent lens. I use mine handheld and on a M42 bellows. There is one for sale right now on eBay as item 3818124789 (not mine).
The ... indicate spaces, the '28' in the s/n '28xxxxxx' indicates it was made by Komine (see www.cameraquest.com/VivLensManuf.htm) and the 'o' of 'o62mm' is the greek letter 'phi', which is a symbol for 'diameter'. Jim, see SPLOSdb (big4) at www.jcolwell.ca
