

I recently received a jewelry master writ with a value of 442 vouchers for a legendary necklace. I'm not sure if it's actually worth the resources it consumes.
I had been sitting on a 460-something blacksmithing forever as it required 9 traits for its armor set. Happily cashed that one in the moment I got Grand Master Crafter last month. That's right at the same range for the highest jewelry master writs I've had (and completed as it had a nice gold cost/voucher ratio and I wanted to get that gold dye for the achievement). Recently got a 420-something clothier master writ.
I recently completed all of my saved master writs, so I don't have currently have any really good ones on hand. Just a few in the 60-80v range.
I've not personally seen any over the 460s, but in a similar thread earlier this year, someone claims they saw one at a whopping 592v! https://forums.elderscrollsonline.com/en/discussion/394003/whats-the-most-writ-vouchers-from-1-master-writ