Actually you may have a french threaded hub.
Are there any discernable markings on the hub? These Maillard 700s on Ebay claim to be French threaded: http://cgi.ebay.com/MAILLARD-rear-hub-700-pro-PISTA-NOS_W0QQitemZ170132576899QQcmdZViewItem
No-one makes french threaded cogs any more AFAIK
So:
1) Post some more details about the hub here or 2) Go to your LBS and have them figure it out.
@pip started
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Actually you may have a french threaded hub.
Are there any discernable markings on the hub? These Maillard 700s on Ebay claim to be French threaded:
http://cgi.ebay.com/MAILLARD-rear-hub-700-pro-PISTA-NOS_W0QQitemZ170132576899QQcmdZViewItem
No-one makes french threaded cogs any more AFAIK
So:
1) Post some more details about the hub here or
2) Go to your LBS and have them figure it out.