Back in 2006 I bought several sets of old dice from Frank Mentzer.

I have remaining three double-partial sets of Mentzer-Era Pre-Production Dragon Dice samples. These were the samples sent by the manufacturer ca. 1983 to TSR for the new run of Dragon Dice to be included in the Mentzer Basic and Expert sets (some had Moldvay dice in early runs).

By the time he sold them to me, there only remained the d4s, d8s, d12s, and d20s; he was not sure if he'd ever even had any of the d6s or d10s.

He therefore gave me three double sets of the four dice, 2x each d4, d8, d12, and d20, in light blue, dark blue, and orange.

I am thinking of selling these as 4-dice sets, one each d4, d8, d12, and d20; and selling one set each of light blue, dark blue, and orange (keeping one set of each for myself).

They are in absolute mint condition (they were in double zip-lock bags wrapped with bubble wrap a box for the last 12 years).

Any idea what these might be worth?

Wow, nice set!

The wax proofs look like they are for Moldvay dice, not the Mentzer dice (it is hard to tell from the d8, if it is elongated or not). If the 3 is rounded on the top rather than flat, they are Moldvay dice. They also appear to have the rounded edges of the Moldvay dice rather than the sharper edges of the Mentzer dice.

Unfortunately, it has been a while since Frank sold a set, as there are no completed sales of his sets in his eBay sales record.

Has anyone bought a set from him off eBay recently, and if so, what was the price?

Frank frequents the Acaeum.  Perhaps he still has records of his past sales that he'd be willing to divulge.