Trinidad 1859 SG43 6d block of 4 in green shade, very fine unused, but top pair has faint horizontal bend, most attractive.  c.v.£640 low start.
A block in the Sir John Marriott collection fetched around £1000 in 2001 (US$1,495)
I'm clearing the remains of my collection in next weeks, so watch this space.  

I will always combine postage, so please wait for my invoice. Please be aware that eBay makes the addition of VAT to the invoice.