many of You worked the 3B7C on Topband already. If not then let's go with me to see what I found on their web pages www.3b7c.com ...
To be able to decide for the best time for calling them on Topband You can use their excellent service -> chart with number of callers from Your country. Hint: The time with the tallest bar is the best time to work 3B7C on that particular band !
160 m: 65 QSOs from 3B7C to OK
160 m: 221 QSOs from 3B7C to W1 (east coast US)
160 m: 10 QSOs from 3B7C to VK6 (west coast)
Well how it works on their pages? Easy...
Go to www.3b7c.com then click to Online Logs. Enter your callsign (or callsign from country You are interested in) to find a qso with 3B7C and click ENTER. After searching the QSO look below the QSOs map for the blue line where is the message: "More leaderboards? The top 100 band/slots stations in CQ zone (xxx) or (yyyy) where (xxx) is zone number and (yyyy) is country name". Click to (yyyy) -> country name to generate the charts for particular bands statistic of callers hour by hour. Roll down for 160m and ...? find the tallest bar which is best time to work them from selected country.
73, Good luck