A608-1988 “THE ARMADA 1588” Royal Mail First Day Cover 19 July 1988 – 5-Stam

Title:
1988 “THE ARMADA 1588” Royal Mail First Day Cover – 19 July 1988 – 5-Stamp Strip (18p) – Commemorative
Category:
Collectibles → Stamps & Postal History → Covers (First Day Covers) → Great Britain
Condition:
Used/Addressed First Day Cover – envelope has been mailed/has a typed address, light ageing and minor toning spots (see photos) but overall presentable for a collector of modern FDCs.
Item Specifics:
Issuer: Royal Mail (Great Britain)
Issue Date: 19 July 1988
Subject: “THE ARMADA 1588” (400th anniversary of the Spanish Armada)
Format: Strip of 5 × 18p stamps on First Day Cover
Postmark: First Day of Issue cancellation (Plymouth, etc)
Addressed: Yes – addressed to “Mr B Makinson, 25 Queensdale Place, Holland Park, London W11 4SQ” (adds provenance but reduces value compared with unaddressed)
Envelope Size: Standard FDC (approx. 41mm × 30mm stamp size as referenced) 
Condition Notes: Some minor foxing/toning spots visible especially near top edge; envelope shows handling/age typical of 35+ years old.
Valuation:
Based on comparable listings:
A listing on “Cover Collecting” for a “Very good condition … one of 3 covers produced …” lists at £30.00. 
Given your cover is addressed, has minor toning, but is original and complete with the strip of stamps and correct cancellation, a realistic valuation might be in the region of £10-20 depending on buyer interest and condition. (Note: specialist rarer versions/un-addressed or special cancels might fetch more.)
Recommended Listing Price & Auction Option:
Buy It Now price: £18.95 – positioned near the upper end of the realistic range but allowing room for best-offer negotiation.
Auction option: Start at £4.99, no reserve (or a low reserve of ~£9), to attract bidding and potentially higher final price if multiple bidders show interest.