Hi @Jarcek Here are the first batch. All can be associated with The Royal Mint since coins from 1279 are associated as being minted by The Royal Mint. Name of the mintmark, dates in brackets.
Let me know if you need anything else, I'll wait for you to do these ones before moving onto the next lot…
1. Cross Pattee (1334-1351 & 1369-1377)

2. Cross 1 - (1351-1352)

3. Cross 1 Broken - (1352-1353)

4. Cross 2 - (1354-1355)

5. Crown - (1356)

6. Cross 3 - (1356-1361)

7. Cross Potent - (1361-1369)

8. Plain Cross - (1369-1377)

9. Pierced Cross with Pellet Centre - (1413-1422)

10. Pierced Cross - (1413-1422 & 1422-1427)
