Gitzo R3 Tripod Head Info Needed

[Scott Sharp]

Gitzo R3 Tripod Head Info Needed
I just bought a older Gitzo R3 (model #370) Pan-Tilt Head. The handles are the flat paddle configuration, the knobs a black plastic. The platform is rectangular, topped with cork, has a slot with a 1/4 inch bolt. I'm guessing maybe 70's or 80's vintage.
I can't find any specs on this head and I'm looking for the maximum load capacity.
I appreciate any information.

[Robert Hughes]

I've got one of those in gray rather than black. Works fine.

[Scott Sharp]

They are well built functional heads with smooth movements. The extral long handle for front and rear tilt almost looks like it was made for cinema use.