Those are wonderful sounding speakers & are in excellent shape. Others would know better, especially on the AudioKarma site thread mentioned, but I think they are the 1st series Professional Monitor I, which came before the Studio model. I'm not an expert though & may be wrong, it looks pre-1971. Placing it as maybe the earliest IMF offering when the company had the previous name you see on your badging. What does the front emblem badge read ?, and what are the words on the back of the cabinet ?
The B139 woofer is the early version, and the tweeter and super-tweeter are very early versions, plus the damping, if original, places it at that time. If badged Transcription Electronics (same company before named IMF) - those are hard to come by & possibly adding much to the value. That exceptional condition is noteworthy.
There was also a later 1981 Professional Monitor series that is different.
You may want to post the foto on AK IMF Owners Thread & ask - what exact model & date is it ? And what is it's selling value in the country you are in (some go higher in some countries - they run lower in the States). Mention the words on the front emblem & back of cabinet - important. Guaranteed you'll find your answer within 1 day response there if you link your foto.
I have IMF RSPM MK IV, Super Compact II and Fried Model R series I models.
You can also find info on (3) sites - Falcon Acoustics UK at IMF tab, IMF-Electronics, and also Yahoo group IMF-Electronics site.
Best of Luck - those are exceptionally nice !
The B139 woofer is the early version, and the tweeter and super-tweeter are very early versions, plus the damping, if original, places it at that time. If badged Transcription Electronics (same company before named IMF) - those are hard to come by & possibly adding much to the value. That exceptional condition is noteworthy.
There was also a later 1981 Professional Monitor series that is different.
You may want to post the foto on AK IMF Owners Thread & ask - what exact model & date is it ? And what is it's selling value in the country you are in (some go higher in some countries - they run lower in the States). Mention the words on the front emblem & back of cabinet - important. Guaranteed you'll find your answer within 1 day response there if you link your foto.
I have IMF RSPM MK IV, Super Compact II and Fried Model R series I models.
You can also find info on (3) sites - Falcon Acoustics UK at IMF tab, IMF-Electronics, and also Yahoo group IMF-Electronics site.
Best of Luck - those are exceptionally nice !