Need help with a Republican anonymous Æ as (Janus/prow)

I was the high bidder at this weekend's Savoca blue and this big ol' Republican bronze caught my eye. Now, it's not EF by any means -- and that's perhaps why I'm having trouble attributing it using Sear.

It's 27.88 g and 31 mm (sestertius-sized for imperial aficionados like me), which is too small for the I above Janus and I above prow but otherwise plain type in Sear, but too heavy to be a post-reform one, which is supposed to be about 20 g or so.

I see only an I above the Janus and only an I above the prow and no other monograms or control marks, but that doesn't mean they aren't there. They could be worn away (I mean look how barely visible the ROMA is at the bottom).

Does anybody have a reference for this one? Dating? Any help is appreciated. I'm out of my wheelhouse here.

 

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It is mentioned in Dictionary of Roman Coins, pp. 84 - 88

https://archive.org/details/dictionaryofroma00stev

where it says that the mark of this money is the sign I but it is not always found on it.Such pieces mostly exhibit the name ROMA on the reverse and many bear the name of families, but there is no Sears number given.

And a very heavy one is here
http://davy.potdevin.free.fr/Site/crawford1.html

Anonymous. As (post-semilibral) circa 215-212, Æ 100.46 g.
Laureate head of bearded Janus. Rev. Prow l.; above, mark of value I above.
Crawford 41/5a. Haeberlin pl. 49, 11. Sydenham Aes Grave 25. Thurlow-Vecchi 70.

 

With 28 Gram your As falls in the 160 BC category

 

IMHO your coin is simply a Crawford 56/2 anonymous As

 

Thank you very much!

 

Andrew McCabe, Roman Republican Anonymous Struck Bronzes, a 175 page explanation of all the supposed Cr.56 types, published in Essays Russo, 2013, this is type D which is the anonymous version of Crawford 50 anchor As and dates from 212 to 206 BC, probably struck at a mint South of Rome possibly in Campania. My own example of this variant here

Not a generic Cr.56/2 as indeed not even minted in Rome. Compare for style same type but with anchor mintmark, evidently same style

 

Of course I won’t discuss an identification made by @Andrew McCabe.
Just to learn more, the style (for what can be seen) looks to me simplier than the elaborated 50 series…For instance Janus nose IMO doesn’t have defined nostrils, but a simple triangular shape.

 

Reviving this thread as I got my first anonymous As with Janus and prow but I can't attribute it

27 mm and 14 g.
Attribution from the house "Anonymous 211 BC. Rome"
Looking in http://numismatics.org/crro/results...cet:"As" AND issuer_facet:"Anonymous"&start=0

All the coins seem much heavier.
Could somebody please help in narrowing it down?