I researched further to realize that pan is not what I thought it was. According to the site that pan features a black 'Enamel Coating' (Interior)!
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Search 'elsewhere' in regards to 'Enamel Coating' came up with the following;
Enamel Coating; this process is done with powdered glass.
Disadvantages with this are;
(1) it can crack especially if you add cold water whilst the pan is hot.
(2) can crack if the surface get too hot.
(3) unknown if there is any lead content in the surface material (Enamel Coating)!
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Whereas Teflon is a synthetic PTFE
.