Caslon is the 231st most used web font on the web. We know 20 popular websites which used this font. Similar popular professional fonts are Iskra, FF Clan, Glypha, ITC Franklin.
You can use the expensive web font Caslon for free, if you are following these steps:
1. Click here to go to the Caslon page on fonts.com
2. Click on Join for Free Web Fonts
3. Enter a email adress and a password and click on Get started free
4. Then click on Create Web Projects and add "Helvetica"
5. Then add the URLs of the domains you want your fonts served to
6. Click on "Publish Options" and insert the shown code into your HTML file
That's all :-)