I am confused about an Antoninianus of Postumus with Neptune Reverse

I have spent today working on some coins from Roman Britain and the Gallic Empire. I have an Antoninianus of Postumus with the NEPTVNO REDVCI reverse. I have three references that show this coin, they are:

RIC V.2 76
Sear Roman Coins and Their Values, Vol. 3 SR-10963
RSC-205a

My problem is that they list different mints for this coin. RIC and RSC list the mint as Lugdunum while Sear shows it as being from Cologne. RIC was puublished in 1933 and the second edition of RSC that I am using was revised in 1982, but Sear Vol. 3 was published in 2005.

Is the reference in Sear the result of modern research while RSC depended on the outdated 1933 information in RIC? Or was this type issued at more than one mint?

 

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There's a debate on Postsumus coins & the hair style. Supposedly straight is Lugdunum & curly is Cologne. But like I said it's up to debate.

Edit- I had the backwards straight is Cologne. My bad.

 

the Lugdunum mint theory is out...there are two current theories 1) coins were struck at Cologne 2) coins were struck at Cologne and Trier.

 

@dougsmit has an interesting point on that.
I not long ago posted a somewhat same question.
I have 2 Postumus ants with Pax reverses. But they to the eye appear different in their own way.
While one shows some silvering in it the other shows no trace. But both are Cologne mint. I attempted looking at Ric for answers only to have the same question as you have about the mints.
Ric and Sear give the hair style explaination.
After I posted Doug replied with an acceptable answer.
Here it is if you want to see it.
https://www.cointalk.com/threads/i-need-a-little-help-with-an-ae-postumus.286881/

I'm getting older my memory isn't what it was, lol.
It was Bing.
Perhaps I should've gone back & read it before making a statement

 

See this page for a summation of the two strongest recent theories.

 

You guys are an amazing wealth of information!

 

Amazing link JA, can find use for thst.

 

Sorry, for the time being, I'm waiting on someone to post not what their theory is but what makes that theory have to be the truth. I like Postumus and continue to gather his coins. Perhaps if I stare at them long enough something will seem obvious but it has not happened yet. Where was this made? I'll say Trier with a 50% level of certainty.

 

So am I. I'm sure Weder has many interesting things to say if only I read German, sigh...

M. Weder, Münzen und Münzstätten der Gallisch-Römischen Kaiser, Teil I SNR 76, 1997 & Teil II, SNR 77, 1998.