This button is not in Albert. Only in Tice Uniform Buttons. Virgina militia late 1830s Kendrick & Co backmark.
I have one, and a potential buyer. I contacted Warren maybe 4-5 years ago and he said he would guess like maybe several 100 in value; I think not however.
It has never appeared on eBay to my knowledge, and I've had a watch for years now. Are there any known sales or auction records? I haven't seen the North South Trader CW price guide for several editions; perhaps there is a listing there?