N79- Denmark 10 øre Block of 4 on Cover – Danish Postage Stamps, Early 20th Ce

Title
Denmark 10 øre Block of 4 on Cover – Danish Postage Stamps, Early 20th Century
Category
Collectibles → Stamps → Europe → Denmark
Condition
Used / Postally used (on cover)
Cover shows light wear, stamps with postal cancellation marks, overall fine condition for age
Item Specifics
FieldValue
Country/Region of ManufactureDenmark
TopicDefinitive / Postal (or Postage Dues, if that is the type)
Year(Estimate, e.g. 1920s)
Lightly Hinged / Never HingedNot applicable (used on cover)
TypeBlock of 4 on Cover
GradeFine / Very Fine
CertificationNone (unless you have certificate)
Suggested Price & Valuation
Estimated value: £5 to £20 (depending on rarity, age, demand)
For instance, similar “block of 4, used / mint never hinged” listings for Denmark 10 øre blocks are often modest in price. 
A reference pin listing claims a Denmark 10 øre “postage due, block of 4” has a catalogue value of £14 (used) in good condition. 
Given that your item is a cover with postal usage, that might reduce the value (unless the cover is historically significant). So a safe valuation might be £8–£12.
Listing Type & Strategy
Fixed Price: £12.99
(Buy It Now with “Make Offer” option)
Auction Option: Start at £4.99, with a reserve price of £9.99
Recommendations / Tips
Add clear, high-resolution photos of both front and reverse of the cover, plus close-ups of stamps and cancellations.
Provide as much detail as possible (date, postal markings, any unique features or flaws).
In description, mention provenance or any known historical context.
Offer tracking and proper packaging to protect the cover during shipping.
Monitor similar listings on eBay (Denmark “10 øre” stamp blocks) to see how they sell.