CoinTalk threads. Links to a few especially interesting threads, page 3.
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Roman: 

FEL TEMP REPARATIO, soldier-spearing-fallen-horseman: 
https://www.cointalk.com/threads/fel-temp-friday-a-fallen-horseman-thread.375587/ 

Hadrian (117-138) "travel series" coins:  
https://www.cointalk.com/threads/a-challenging-travel-series-coin-of-hadrian.391596/

Probus (276-282)
https://www.cointalk.com/threads/an-ugly-probus-but-i-am-happy-with-it.394696/

Helena, mother of Constantine. (c. 326) Her hairstyles
https://www.cointalk.com/threads/helena-style-show.316613/

Caesarea in Cappadocia
https://www.numisforums.com/topic/772-roman-silver-from-caesarea-cappadocia/#comment-13189

Byzantine:

Byzantine 11th C. Trachy, an introduction to Byzantine coins of that shape:  
https://www.cointalk.com/threads/an-introduction-to-billion-and-ae-trachea-the-eastern-roman-byzantine-billion-trachy.395803/

Byzantine 12th C. gold coins:
 https://www.cointalk.com/threads/byzantine-gold-of-the-12th-century-a-collector%E2%80%99s-playground.379175/

Collecting: 

Defintions of cleaning, smoothing, and tooling: 
https://www.cointalk.com/threads/the-smoothing-process.304206/

How to find the provenance of an important coin:  
https://www.cointalk.com/threads/up-to-100-if-you-can-find-a-provenance.398464/

 

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