This is stock number 07731, made for the SVD 4.5 and VX102. I got it here on Astromart several months ago, and slightly altered the foam tape that goes between the filter and the dew shield for the scope to make it fit my Orion 120ST like a glove. I have since sold the 120ST and don't need this any more. If you need it to fit these (or comparable scopes) it's a very easy job to replace the tape. Filter is in excellent shape and I only used it a couple of times. They sell for $69 plus shipping from Orion. I'll take $50 shipped. Payment by money order please.