Thank you for contacting Mearto. I have not been able to find you any definitive answers, but let me share what I’ve looked at. The following are asking prices, not sales results. For CB alone and PP alone, I found around $50 to $150, except for a major outlier, on a Chinese website I am unfamiliar with. On a different Chinese site, I found CB and Sch. set for $2000. I was unable to translate the sites and I have not seen them before. I came across the three sold as a set on ebay for $350 and thought I found gold, but I matched it to your photo, so I think it was yours. My only other find was a site called Worthpoint. It offers sales results but it is a paid subscription. I don’t have it, but it looks like you can do a free trial. It might be worth it. I saw that they had Pig Pen and Schroeder dolls in their listings. I hope this was helpful and I’m sorry I was unable to provide you with any clearer answers. For the FMV above, I will estimate based on the $50-$150/doll I found.

CB, asking prices
42
http://www.xl-shop.com/xlshop/pages/MD-211084/medicom-toy-vinyl-collectible-dolls-charlie-brown
150
https://www.carousell.sg/p/snoopy-charlie-brown-by-medicom-toy-37899292/
3800
https://www.ruten.com.tw/item/show?21826268937600
165
https://www.ebay.com/itm/MEDICOM-TOY-VCD-Charlie-Brown-/174504242739?_ul=AR

CB and Sch.
2000
https://shopee.tw/amp/-%E7%8F%BE%E8%B2%A8%EF%BC%BD%E5%B7%B2%E6%8B%86-%E7%9B%92%E6%B3%81%E5%B7%AE-medicom-VCD-%E6%9F%A5%E7%90%86%E5%B8%83%E6%9C%97-%E8%88%87%E6%9C%8B%E5%8F%8B-%E5%85%B1%E5%85%A9%E6%AC%BE-snoopy-%E5%8F%B2%E5%8A%AA%E6%AF%94-i.2588044.3107527904

PP
140
https://www.ebay.com/itm/174632680774?hash=item28a8eb3d46:g:Qo4AAOSwZWlgI~ib

website locked
PP
https://www.worthpoint.com/inventory/search?query=medicom+snoopy+pig+pen&categories=
Sch.
https://www.worthpoint.com/inventory/search?query=medicom+snoopy+schroeder&categories=