On 1/10/2020 11:04 AM, between "Wilfred van Velzen : August Abolins":

 AA>> According to the dates (and time), we have exactly the same
 AA>> version of your keys. So, if Tommi (or me) signed your key,
 AA>> and I refreshed your keys on my systems, then the
 AA>> error "BAD signature" message to me would go away?

 WvV> No. 'BAD signature' really means a bad signature!

What made it report BAD for me?  It was exactly the same pub key pair
between us.  The exact time and date proved that.

--- Thunderbird 2.0.0.24 (Windows/20100228)