A606-GB 1988 “25th Anniversary British Philatelic Bureau” Souvenir Cover 16 Ma

Title:
GB 1988 “25th Anniversary British Philatelic Bureau” Souvenir Cover – 16 May 1988 Edinburgh, Unused/Presented to Bureau Customers
Category:
Collectibles → Stamps → Great Britain → First Day Covers & Souvenir Covers
Condition:
– Appears unused (no address, no additional writing, envelope flap still sealed)
– Presents well; two commemorative stamps (26p “By Boat”, 18p “By Train”) affixed and postmarked “BRITISH PHILATELIC BUREAU – 16 MAY 1988 – EDINBURGH”.
– Minor shelf-wear only (please examine photos carefully for any discoloration, creasing or hinge remnant).
– Labelled “PRESENTED TO BUREAU CUSTOMERS MAY 1988” on front — giving provenance as a promotional souvenir.
– This is a postal souvenir cover rather than a standard commercial usage.
Item Specifics:
Country/Region of Postal Use: Great Britain
Year of Issue: 1988
Theme: Philatelic Bureau Anniversary / Transport (By Boat & By Train)
Type: Souvenir Cover / Promotional Cover
Cancellation Date: 16 May 1988 (Edinburgh)
Catalogue/Reference: British Philatelic Bureau 25th Anniversary issue
Quantity (if applicable): Single cover
Condition (detailed): As above — unused, clean, stamps intact, crisp cancellation, envelope in very good condition
Includes original envelope only; no certificate or extra inserts unless noted
Shipping/packaging: Will be protected in stiff card, sealed in clear sleeve, shipped with tracking (buyer to pay for international shipping and any import duties)
Valuation / Recommended Pricing:
Estimated market value: Given listings of similar items (for example one ended for AU $2 ≈ £1 at auction recently)  and others listed at around US $4.99 ≈ £4.00 for a “buy it now.” 
Considering condition (unused/unaddressed promotional cover) and international shipping to Sri Lanka or elsewhere, a fair Buy It Now price would be around £8 – £12.
If you wish to allow negotiation/auction: recommended starting bid could be around £4.00 with no reserve, or £5.00 with a modest reserve.
Recommended eBay listing price (Buy It Now): £10.00
Recommended auction option: Start at £4.00, duration 7 days, no reserve (or reserve at £6 if you prefer).
Listing Description (Example):
> This is a genuine promotional souvenir cover issued by the British Philatelic Bureau in May 1988 to mark its 25th anniversary. It has never been used for post, still sealed, and features the official cachet “PRESENTED TO BUREAU CUSTOMERS MAY 1988”. The envelope bears two commemorative stamps (26p “By Boat”, 18p “By Train”) and a clean clear Edinburgh cancellation dated 16 May 1988. A nice piece for the GB thematic or bureau-specialist collector. Condition: very good, no address, flap intact. International
Shipping & Payment:
Shipping cost: you may quote e.g. £3 standard worldwide (or adjust for your region)
International buyers responsible for import/customs duties
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