How expensive could be error Blastoise from Base Set without word “stage” on its right upper corner? 
There is one in completed listings on eBay for 150 dollars.
nobody knows 
@medix - I have never heard of this error, previously. Although…
I just discovered this thread regarding Blastoise [Error; Base, 2/102]. It may help give you an idea or speculation of what it could be worth 
Thanks for the answer 
Its interesting.