145203 1863 UNDERPAID MAIL LONDON TO AMSTERDAM 6d (SG83) AND 1d (SG42) 'INSUFFICIENTLY/PREPAID' HANDSTAMP.

1863 UNDERPAID MAIL LONDON TO AMSTERDAM 6d (SG83) AND 1d (SG42) 'INSUFFICIENTLY/PREPAID' HANDSTAMP. Fine wrapper London to Amsterdam 'via Ostende' with fine 6d deep lilac (SG83) lettered OG and fine Die 2 1d alphabet IV pl.50 (SG42) lettered LE, both tied fine strikes London '12' numeral cancellation. Postage underpaid with very fine strike 'INSUFFICIENTLY/PREPAID' handstamp in black. On reverse 'LONDON' date stamp MR 12 63 in blue and 'AMSTERDAM' date stamp 14 3 63 in red. A very scarce usage combining alphabet IV and underpaid mail going overseas. (Ref 145203).