Hi Mitch:
Leslie Barany is Giger's agent and might be able to put you in contact with someone who could acertain the provenance, authenticity and price of these pieces:
Telephone: (212) 684-2225
E-Mail:
Les@hrgiger.com
Also, contact James Cowan, President of Gallerie Morpheus International. Gallerie Morpheus has handled and sold many Giger works over the years. They would be able to give you an assessment:
125 East Reno Avenue, Suite #17
Las Vega, Nevada 89119
United States of America
Telephone: (702) 233-3339
Facsimile: (702) 739-3331
E-Mail:
curator@morpheusgallery.com
Giger gave away his artwork for peanuts (or was entirely swindled out of them) by unscrupulous speculators in his early years as an unknown talent. After his reputation was established with
Alien's release in 1979, he began a campaign to re-acquire all those pieces he'd sold when he was still working as a lowly draftsman at an architectural firm. He is used to paying exorbitant prices to buy back his works, but may try to low-ball you. Still, be on guard against any sharp practice.
In the meanwhile, help them to help you: Do a little research into the prior owner, his former addresses, neighbours and associates to help establish the provenance of the artwork. It will take a little money (probably about ₤75.00 BSP or less) and some time and effort on your part, but it will be very much worth your while to do so.
After you can prove they're authentic, if you can afford it, it would be prudent to get them insured and placed in a security deposit vault for safe keeping. The value with certainly rise with time.
If you have any problems or need any further information feel free to contact me any time. Until then, take care and congratulations on your marvelous stroke of good fortune!