Antique anatomical skull/skeleton drawing

Possibly from an old medical book. In excellent condition. I have no idea who drew it since I do not want to unseal it from the frame that it’s been professionally placed in. I found it in a storage unit along with several other pieces of art. Online estimation appraisal says it’s worth between $800-$300 but could be worth more depending on condition and who the artist was if there’s a way to tell. It seems to be in excellent condition and professionally sealed in the frame. Meet up preferred since the insurance on shipping would be pretty high and I don’t trust usps to not damage or lose it during transport. But if buyer prefers to have it shipped I can ship it.