Mark Ostendorf's Discussions (18)

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Discussions Replied To (12) Replies Latest Activity

"That was my opinion. I replaced it.  Thanks for your opinion. How did you arrive at…"

Mark Ostendorf replied Jun 15 to van halen collector

 7 Jun 16
Reply by Harald Greisen

"This one I've had for quite some time - no coa.  Is it worth trying to authenticate?…"

Mark Ostendorf replied Jun 15 to van halen collector

 7 Jun 16
Reply by Harald Greisen

"OK - now just to see if I know what I"m doing - here is one with no COA - and I thin…"

Mark Ostendorf replied Jun 6 to van halen collector

 7 Jun 16
Reply by Harald Greisen

"Thank you - that is something I've started to notice from questionable sellers - per…"

Mark Ostendorf replied Jan 19, 2022 to Keanu Reeves from Platinum Authentics?

 10 Jan 19, 2022
Reply by BC

"Thanks for this, I saw some authenticated ones that looked like yours, with more cur…"

Mark Ostendorf replied Jan 19, 2022 to Keanu Reeves from Platinum Authentics?

 10 Jan 19, 2022
Reply by BC

"The lady said she didn't recall the exact date, but thought it was around 1980 or 81…"

Mark Ostendorf replied Jan 14, 2022 to Opinion on my Joan Jett and the Blackhearts signed album.

 5 Jan 14, 2022
Reply by Mark Ostendorf

"From what I've seen, the bottom's of her J's and L's have gotten larger over time? …"

Mark Ostendorf replied Jan 12, 2022 to Opinion on my Joan Jett and the Blackhearts signed album.

 5 Jan 14, 2022
Reply by Mark Ostendorf

"After studying Dan's Willis, I would say this one is much more likely to be genuine…"

Mark Ostendorf replied Dec 15, 2021 to Bruce Willis 2 to compare.

 10 Dec 15, 2021
Reply by Dan Morris

"OK - I have an Alan Rickman from Die Hard that is certified, and I'd like to have a…"

Mark Ostendorf replied Dec 14, 2021 to Bruce Willis 2 to compare.

 10 Dec 15, 2021
Reply by Dan Morris

"OK, thanks.  the black ink one is Beckett certified and it checked out on their site…"

Mark Ostendorf replied Dec 14, 2021 to Bruce Willis 2 to compare.

 10 Dec 15, 2021
Reply by Dan Morris

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