Help me date my MXR Blue Box

MXR M103 Blue Box Octave Fuzz This is the crazy effect heard on Jimmy Page's Fool in the Rain solo. The Blue Box Octave Fuzz takes your guitar signal and duplicates it two octaves down for a huge, subterranean tone. The Blend knob lets you control how much of the fuzz tone is mixed with the two octaves down signal. Not for the timid- there is truly nothing like the Blue Box.

MXR M103 Blue Box Octave Fuzz Distortion Pedal

Can anyone help me date these? : r/guitarpedals

Vintage MXR Debate: Script versus Block logos –

MXR Duke of Tone Guitar Pedal Review - Premier Guitar

MXR JD-M222 Talk Box Effect Pedal w/ Tube – Music City Canada

The MXR Blue Box takes your guitar signal, fuzzes it up, then duplicates it 2 octaves down. You control the output and the mix between the dry signal

MXR M-103 Blue Box

Help me date my MXR Blue Box

Years of Production: 1972 - 1978, 1995 - present, Notable Users: J Mascis, King Buzzo

MXR MX-103 Script Blue Box 1975 - 1984

MXR Blue Box- Signal Bleed Demo